Calculating machine



June 1938- E. F. BRITTEN, JR

CALCULATING MACHINE Filed Dec.-29, 1936 2 Sheets-Sheet l INVENTOR 6. (KG/13mm ATTORN E June 21,1938. EF TTE JR 2,121,683

CALCULATING MACHINE Filed 'Dec. 29, 1936 2 SheetsSheet 2 INVENTOR.

' 6.5; Mammy 5k v ATTORNEY? Patented June 21, l938 a a v [UNIT D STATES PATENMT OFFICE:

2,121,683 CALCULATING mom Edwin F. Britte -Jr, Short inns, N. J., assignor to Gardner Company, Orange, N. J., a corporation of Delaware Application December 29, 1936, Serial No. 118,133

4 Claims. (c1. 235-60) The invention has relation to calculating ma- Figure 8 is a detail side view of a digital key, chines, and particularly to the keyboard mecha the slides engaging the key stem being shown in nism thereof. section. 7

Full Stroke ch sm r th di i l k y of In these drawings, the invention is shown as key drive adding machines is well known wherein applied to a listing calculator of the Gardner 5 a partially depressed digital key is held in half jtype, disclosed in its essential features in the way position. patent to Loring P. Crosman, No. 1,932,013, dated It is also known to provide means for latching October 24, 1933. r the digital keys of key-set calculating machines 10 in fully depressed position. It frequently hap- General operatic/n pens however, that an operator may fan to de- As described in said patent, the digital keys 2I5 press a, key sufficiently for t t b 1 t h d, rm for each denominational order which are desince the machine may be operated while the key p ed to p ent a va f o One to nine, are i so held, a alc l t may lt, latched in fully depressed position with the lower It has also been proposed, according to U. S. ends of the y Stems located in the P 0f 15 Patent No. 1,877,802, issued to the present invene t of the e ated teeth of the related tor on September 20, 1932, t provide pecial differentially movable member or stop bar 6I5, switch in the motor circuit, which switch remains by al owi said stop b rs to advance a d sbroken so long as any digital key is in partially tance corresponding 11. t Va Of Said ey depressed position, Here, however, there is no p p 0f the c e p st latch for holding s id key partially depressed, of a digital key will also cam a slide I forwardly and therefore the partially depressed key will on a d e ove a column a ch from the p of release thereof return to normal position, thereby movgmeht 0f the ed t p bar these closing the switch and allowing an incorrect oplatches prevent movemen of a stop bar fi oration. \r v and an actuator lever of any column in which no 25 It is the object of the present invention to digital y s depressedprovide means for rendering the cycle operating A cycle ofhperationt-akes p ac s follows; mechanism inoperative until complete depres- Depression of general Operation y trips sion of any partially depressed digital key a latch ii! to release clutch control lever I06,

Another object is to provide means whereby a Said lever being moved by its spr n ill Out Of 30 key held partially or fully depressed will act to gement with the tail arm of clutch p look a total taking key against depression. said p being p o ed fulclllmed p The invention consists in the novel construca stud of crank arm 05 O a S a 5'- S d tion and combinations of parts as hereinafter clutch n wlbe s t e e y re e will be rocked set forth in the claims. by its spring 2 into engagement with one of the 35 In the accompanyin -drawi circumferential notches of clutch disk 3, said Figure 1 is a, right side ele ti of certain disk having suitable drive, connection with the parts of the machine, brok away i t, and motor I00. This clutch disk 3 forms one member showing the cycle operating switch and clutch of a clutch d sa d pa 03 forms t e other 40 means. member thereof, and said clutch being rendered 49 Figure 2 is a composite longitudinal section of operative as stated the shaft I05" and its crank the keyboard and parts operating in connection m will be dr ve following the Closing of th rewith, b ok away in t, the motor switch to be described as follows:

Figure 3 is a rear elevation of the keyboard and Pivotally mfilmted p Stud 5 0f the machine 46 parts operating in connection therewith, broken frame Whereon clutch control level 1S flllaway in part, crumed is an arm 6, provided at its free end with Fi 4 1 d t u tt plan view of the an insulated roller I09 engaging one of the spring keyboard locking slides, broken away in part, contacts of motor switch Ifi'lfsaid arm 6 having Figure 5. a section on t hue 5 5 Figure 2, also at its free end a stud I located opposite to 50 parts being b k away, and spaced'from roller I09, said stud being en- 50 Figure 6 is a detail side view of a portion of gaged by the clutch trol l ver I06, and as the motor switch operating means, parts being said lever is rocked as stated, said arm 6 will be broken away. rocked therewith, the roller I09 acting to close Figure? is a detail side view of further portions the contacts of switch I01, thereby initiating a 56 thereof, parts being broken away. I g cycle of operation.

' lever I and restore said lever to normal position and re-engage it with the latch II2, said lever contacting the tail arm of clutch pawl I03,"

and rocking said pawl out of engagement with clutch disk 3, to render the clutch inoperative and complete the cycle.

The motor switch I01 is held closed during this action and until the end of the cycle by means described as follows:

Crank arm I05 imparts oscillatory movement through link I00 to pivoted arm 3I5, the latter having link connection 0 with pivoted arm 321 to oscillate the latter in unison therewith. The arm 321 normally has engagement with a spring tensioned finger I0, pivoted on the aforesaid frame stud 5, the free end of said finger engaging said roller I 09, of the arm 6.

During a cycle of operation, the arm 321 is carried away from said finger I 0, allowing the latter under the influence oi! its spring II to follow the roller I09 in its aforesaid movement, thereby holding the switch contacts closed during the restoration of the clutch control lever I05 and until the end of the cycle, when the arm 321 will re-engage said finger I0 and restore it to normal position against the tension of its spring, thereby permitting the spring contacts of the said switch to open.

Means for disabling the cycle operating mechanism Means are provided for holding the digital keys in partially depressed position and for holding the aforesaid clutch inoperative and the aforesaid motor switch open, notwithstanding the depression of the general operation key Ill, said means being described as follows:

For each denominational column of digital keys 2I5 is provided a longitudinal slide I2, similar to the slide I, and normally urged by its spring I3 against the forward edges of the key stems beneath cam portions 2I 01 said stems to hold said keys in normal raised position.

A transverse slide I5 is provided with a plurality of teeth I5, one tooth for each denominational column, and the slide I2 of each said column is provided at one end thereof with a lateral projection I4, normally located adjacent to but out of the path oi movement of slide I5. Slide I5 has a rearward extension I6, provided with a notch engaged by one arm of a bell lever I1 as seen in Figure 3, said bell lever being i'ulcrumed at I0 to a stationary framing bracket I9, and having link connection 20 with a forward extension of the clutch control lever I06.

During the depression of a digital key 2I5 of any column, the related slide. I2 will be cammed forwardly to bring said lateral projection II of the slide into the path of movement of the related tooth of said transverse slide I5, thereby holding the clutch control lever I08 against operation to disable the cycle operating mechanism. At the end of a full stroke of the digital key, the slide I2 will be released from the cam portion 2| of the key stem and moved rearwardly by its spring I3 until stopped by the stem of the key, coming to rest above the shoulder 22 of said cam portion and thereby holding the key in fully depressed position, the lateral projection I4 of said slide I2 being at the same time moved out of the path of movement of the related tooth of slide I5, to thereby enable the cycle operating mechanism.

A partial depression of a digital key 2I5 will the key being prematurely released said slide will engage a notch 23 in said cam portion 2I of the key stem, thereby holding the key in partially depressed position, and as said movement of the slide I2 will bring its projection I4 into the path of the movement of the related tooth of slide I5, it will be so held.

The general operation key II 4 being now depressed in an attempted initiation of an operating cycle of the machine, and the clutch control lever I06 beingconsequently tripped, said lever will be allowed to move only sufficiently to bring its upper lug 24 below the terminal lug of latch II2 to hold the latter in unlatched position, and due to the fact that the slide I2 has been previously moved as stated to bring its projection I4 into the path of movement of the related tooth of 'slide I5, said slight movement of the lever is limited, thereby preventing engagement of the clutch members I03 and 3 and also preventing the closing of the contacts of the switch I01, until the partially depressed digital key shall have been fully depressed.

The notch 23 of the cam portion of the key stem has an upper cam wall permitting further depression of said key to release slide I2 from said cam portion, whereupon slide I2 will be returned by its spring and engage the key stem above the shoulder 22 of said cam portion thereof to thereby hold said key in fully depressed position, the lateral projection I4 of the slide being at the same time moved out of the path of movement of the related tooth of the slide I5 to enable the cycle operating mechanism, whereupon the clutch control lever I06 will be rocked by its spring III to start the operating cycle of the machine and said lever being so rocked the slide I5 will be moved to bring its said teeth into the path of movement of the lateral projections I4 of the slides I2 to thereby hold all of the digital keys of all columns against depression during said operating cycle.

Duringthis cycle, cam portion II5 to crank arm I05 will restore clutch control lever I 06 as previously described, to thereby restore slide I5 to normal position prior to operation of the wellknown keyboard clearing devices by arm 321.

Means for locking the keyboard during total operations Depression of total key 218 imparts counterclockwise movement to bell lever 29, fulcrumed at 206, and having one arm thereof engaging cam edge 30 (Fig. 5) of a transverse slide 28, to thereby move said slide endwise and bring the teeth 21 of the slide into the paths of movement of the projections 26 (Fig. 4) of all of the slides I, to thereby lock said slides I against forward movement, thus locking the keyboard during total operations. Bell lever 29 being actuated as above stated, the other arm thereof actuates arm 29 pivoted at 206 to thereby impart a partial movement to clear-out bail 221 suflicient to release the column latches 2I4 from the stop ba s 6| 5.

Total key look upon partial depression of a digital keg Means are provided under control of the digital keys and operable by a partially depressed digital key to lock the totals key against depression, so that a previously attempted registration must be completed before a total can be taken, this means being described as follows:

A digital key being partially depressed and prematurely released, said key will be held in partially depressed position, and the general operation key H4 being then depressed in an attempted initiation of an operating cycle of the machine, the released clutch control lever I06 will be allowed a very limited movement and the clutch members I03 and 3 will be prevented from engagement and the contacts of the motor switch I01 will be prevented from closing until the partially depressed digital key shall have'been completely depressed, as previously explained.

The partial depression of a digital key will cam the related slide I forwardly to bring the projection 26 of said slide into the path of movement of the related tooth 21 of the transverse slide 28, thereby locking the totals key against depression, so that said previously attempted registration must be completed before a total can be taken.

I claim:

1. In a key-set calculator including a plurality of columns. of digital keys, register operating means including an electric motor, a normally open switch and differentially movable elements under control of said digital keys, and means including a manual key for accomplishing the closing of said switch; means displaceable to hold said digital keys in fully or partially depressed position, and means operable by the displaced holding means to hold said switch open notwithstanding the operation of said manual key when said digital keys are partially depressed.

2. In a key-set calculator including a plurality of columns of digital keys, register operating means including an electric motor, a normallyopen switch, a switch control lever and diiIerentially movable elements under control of' said digital keys, and means including a manual key for releasing said lever and accomplishing the closing of said switch; slide devices displaceable cluding a manual key and a normally restrained spring device releasable by said key to'accom- -p1ish the closing of said switch; means operable to hold said digital keys in fully depressed position, and displaceable from normal position to hold said digital keys in partially depressed position, and means operable by the displaced holding means to hold said switch open notwithstanding the release of said spring device and releasable to accomplish the closing of said switch upon further depression of said digital keys. I

4. In a key-seticalculator including a plurality of columns of digital keys, register operating means including an electric motor, a normally open switch, a normally inoperative clutch and differentially movable elements under control of said'digital keys, and means including a manual key for rendering said clutch operative and for accomplishing the closing of said switch; means operable to hold said digital keys in fully depressed position, and displaceable from normalposition to hold said digital keys in partially depressed position, and means operable by the dis- EDWIN F. BRI'I'I'EN, JR. 

